Hi, I am having a mysterious and frustrating film isse. Yesterday I processed a roll of 120 TMAX 100 film, which was shot with my Hasselblad 500cm. I have been using the camera consistently for the past year or so and haven't had any issues. The roll was processed with Clayton f60 developer. It came out completely clear - there were no edge markings or numbers. That has never happened to me before. I thought maybe the pre-wash or developer had somehow gotten contaminated with fix, since I was working in a shared darkroom. Today I shot another roll of 120 TMAX 100 in the same camera, and processed it, as well as 3 35mm rolls, all with the same chemistry. Before processing, I washed out all of the containers and mixed new chemistry to ensure that it wasn't contaminated. All three 35mm rolls came out - 2 rolls of Ilford HP5 400 and one of Tri-X 400 - but again, the TMAX 100 120 film was completely clear, with no writing or numbers visible. Since the 35mm film came out with the same chemistry, it doesn't seem like a processing issue. I thought maybe an issue with the camera but the numbers have been advancing and I am able to take the back off and see the shutter opening. Also, if it was an issue with the camera rather than developing, I would think there would be writing and numbers visible. The only other difference in processing the different formats was I used a metal tank and reel for the 120 and plastic for the 35mm but I don't think that could be the issue. It wasn't a light leak because then it would be dark instead of clear and the chemistry went in properly. Does anyone know what the issue could be? Is it possible those two rolls were defective in some way? I purchased them both together. Thanks!!